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A link name was given with an empty name.
Erroneous code example:
```compile_fail,E0454
#[link(name = "")] extern "C" {}
// error: `#[link(name = "")]` given with empty name
```
The rust compiler cannot link to an external library if you don't give it its
name. Example:
```no_run
#[link(name = "some_lib")] extern "C" {} // ok!
```
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